Well, sounds like I have the perfect storm of noise generation. The benchwork is attached to a wall that is paneling over studs, but at least there is both insulation board and fiberglass behind it. I have tried plain styro insulation board under the MTH, then cork on top of the insul. board under the MTH, and none of it is as quiet as plain old Lionel 3 rail over cork on the plywood. I also don't notice enough improvement with cork on the styrofoam with the tubular to custom cut a layout full of it. The rubber back carpet idea is worth a try, have some scrap around here somewhere. Of course I have only run a vintage loco back and forth over a 10 foot straight stretch for the testing.
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